Reporting by Chicago public radio station WBEZ, the Chicago Sun-Times and the Organized Crime and Corruption Reporting Project (OCCRP) has identified nine current and at least 18 former members of the Chicago Police Department on past internal rosters of the Oath Keepers obtained by OCCRP. The investigation identified another 12 working in law enforcement elsewhere in Illinois who were on these lists, which cover the period from 2009 to 2018.